288 results found displaying 40-42
Jesse Bang
Active sonar cancellation Printer Friendly Version
Perhaps if we can outfit submarine hulls with two layers instead of one, we might be able to cancel out the reflected waves. I have already measured out how thick the gap between the hulls should be: x(lambda)/4; where x is any odd integer. In this way, we will recieve reflection where the waves have the least energy, which is at the equilibrium.
The first layer should be any kind of material able to transmit 66% of wave energy and reflect 33%. 66% of the wave energy is transferred into the gap between the hulls, where it is then reflected yet again through the first layer. This accounts for 66% of 66% of the initial wave energy. since it most nearly matches that of the originally reflected 33%, and since the spacing is correct so that dephasing might occur, most of the waves will be cancelled, creating a much, much weaker sonar signal. It might be small enough to even avoid detection by sonar systems aboard submarines. If no such material is available, perhaps ordinary steel with holes would work.
Of course there is the significant problem of not knowing the wavelengths of the many thousands of sonar devices on submarines throughout the world.
Reward: the navy's recognition of a feasible technology 

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J Selwyn
Pollution Tracking Device Printer Friendly Version
I have an idea about pollution that may really stop industries and the gov't from dumping trash in our backyards! There are countless examples of companies dumping their trash, usually on the poor side of town.
I think that all companies and individuals should be ranked by how much trash/waste they produce. This could be done by producing trash cans & dumpsters with sensors that count the amount of mass in the container per week. For liquid waste (which many companies dump liberally into streams & oceans), a mandatory tracking device on all pipes shows how much waste is being released, and with what chemical makeup. People and companies have a moderate waste allowance per year, and a tally is kept automatically in a central system monitored by local citizens.
Here's the deal... the more you pollute (as shown by the tracking device), the closer city planners put local dumps to your location. So trash is not kept in one huge location out-of-town, but in small pockets near you. If you produce huge wasteful amounts of waste or small toxic ones, the community is notified and you get a nice plaque with a garbage can, presented by the mayor, at a ceremony before the town. Then you get trash from the community that you polluted. The dump would ideally be located near where the president or board of directors of the pollution company live. Brimming recycling cans or ecologically safe liquid waste would be balanced against your trash and reflected in your total account. To introduce this idea to a largely wasteful public, perhaps less waste could be tied to property tax benefits the first couple years (since it would cut down on city costs). I think that these tracking devices would not be hard to create (I welcome your messages), but real struggle is getting the gov't to agree.
So as a clause to the idea, if a huge polluter doesn't get the point of all this after a year, garbage is sent from the local dump to be buried in a special congressional dump for each representative of your community, who didn't crack down on the polluter in the first place.
Reward: Some credit, and a cleaner stream to swim in... 

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Ann Moroz
Pocket Cordless Phone Printer Friendly Version
I would like a flip-type handset for plain old cordless phones. While we all have cordless phones, they offer no protection to keep the buttons from being accidently pushed. They have them for cell phones, why not for cordless. I carry a phone with me all day but would like to be able to put it in my pocket. We keep 4 phones in our home/business and I'll be the first buyer.

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